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Number of molecules in a volumne of 4 cm...

Number of molecules in a volumne of `4 cm^3` of a perfect monoatomic gas at same temperature T and at a pressure of 2 cm of mercury is close to ? (Given,mean kinetic energy of a molecule (at T) is `4 xx 10^(-14)` erg, ` g = 980 cm//s^2`, density of mercury `= 13.6 g//cm^3`)

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